// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "storage/browser/fileapi/file_system_usage_cache.h"

#include <stdint.h>

#include <limits>

#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/threading/thread_task_runner_handle.h"
#include "testing/gtest/include/gtest/gtest.h"

using storage::FileSystemUsageCache;

namespace content {

class FileSystemUsageCacheTest : public testing::Test {
public:
    FileSystemUsageCacheTest()
        : usage_cache_(base::ThreadTaskRunnerHandle::Get().get())
    {
    }

    void SetUp() override { ASSERT_TRUE(data_dir_.CreateUniqueTempDir()); }

protected:
    base::FilePath GetUsageFilePath()
    {
        return data_dir_.GetPath().Append(FileSystemUsageCache::kUsageFileName);
    }

    FileSystemUsageCache* usage_cache()
    {
        return &usage_cache_;
    }

private:
    base::MessageLoop message_loop_;
    base::ScopedTempDir data_dir_;
    FileSystemUsageCache usage_cache_;

    DISALLOW_COPY_AND_ASSIGN(FileSystemUsageCacheTest);
};

TEST_F(FileSystemUsageCacheTest, CreateTest)
{
    base::FilePath usage_file_path = GetUsageFilePath();
    EXPECT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 0));
}

TEST_F(FileSystemUsageCacheTest, SetSizeTest)
{
    static const int64_t size = 240122;
    base::FilePath usage_file_path = GetUsageFilePath();
    int64_t usage = 0;
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(size, usage);
}

TEST_F(FileSystemUsageCacheTest, SetLargeSizeTest)
{
    static const int64_t size = std::numeric_limits<int64_t>::max();
    base::FilePath usage_file_path = GetUsageFilePath();
    int64_t usage = 0;
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(size, usage);
}

TEST_F(FileSystemUsageCacheTest, IncAndGetSizeTest)
{
    base::FilePath usage_file_path = GetUsageFilePath();
    uint32_t dirty = 0;
    int64_t usage = 0;
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 98214));
    ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
    EXPECT_TRUE(usage_cache()->GetDirty(usage_file_path, &dirty));
    EXPECT_EQ(1u, dirty);
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(98214, usage);
}

TEST_F(FileSystemUsageCacheTest, DecAndGetSizeTest)
{
    static const int64_t size = 71839;
    base::FilePath usage_file_path = GetUsageFilePath();
    int64_t usage = 0;
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
    // DecrementDirty for dirty = 0 is invalid. It returns false.
    ASSERT_FALSE(usage_cache()->DecrementDirty(usage_file_path));
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(size, usage);
}

TEST_F(FileSystemUsageCacheTest, IncDecAndGetSizeTest)
{
    static const int64_t size = 198491;
    base::FilePath usage_file_path = GetUsageFilePath();
    int64_t usage = 0;
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
    ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
    ASSERT_TRUE(usage_cache()->DecrementDirty(usage_file_path));
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(size, usage);
}

TEST_F(FileSystemUsageCacheTest, DecIncAndGetSizeTest)
{
    base::FilePath usage_file_path = GetUsageFilePath();
    uint32_t dirty = 0;
    int64_t usage = 0;
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 854238));
    // DecrementDirty for dirty = 0 is invalid. It returns false.
    ASSERT_FALSE(usage_cache()->DecrementDirty(usage_file_path));
    ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
    // It tests DecrementDirty (which returns false) has no effect, i.e
    // does not make dirty = -1 after DecrementDirty.
    EXPECT_TRUE(usage_cache()->GetDirty(usage_file_path, &dirty));
    EXPECT_EQ(1u, dirty);
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(854238, usage);
}

TEST_F(FileSystemUsageCacheTest, ManyIncsSameDecsAndGetSizeTest)
{
    static const int64_t size = 82412;
    base::FilePath usage_file_path = GetUsageFilePath();
    int64_t usage = 0;
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
    for (int i = 0; i < 20; i++)
        ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
    for (int i = 0; i < 20; i++)
        ASSERT_TRUE(usage_cache()->DecrementDirty(usage_file_path));
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(size, usage);
}

TEST_F(FileSystemUsageCacheTest, ManyIncsLessDecsAndGetSizeTest)
{
    uint32_t dirty = 0;
    int64_t usage = 0;
    base::FilePath usage_file_path = GetUsageFilePath();
    ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 19319));
    for (int i = 0; i < 20; i++)
        ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
    for (int i = 0; i < 19; i++)
        ASSERT_TRUE(usage_cache()->DecrementDirty(usage_file_path));
    EXPECT_TRUE(usage_cache()->GetDirty(usage_file_path, &dirty));
    EXPECT_EQ(1u, dirty);
    EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
    EXPECT_EQ(19319, usage);
}

TEST_F(FileSystemUsageCacheTest, GetSizeWithoutCacheFileTest)
{
    int64_t usage = 0;
    base::FilePath usage_file_path = GetUsageFilePath();
    EXPECT_FALSE(usage_cache()->GetUsage(usage_file_path, &usage));
}

TEST_F(FileSystemUsageCacheTest, IncrementDirtyWithoutCacheFileTest)
{
    base::FilePath usage_file_path = GetUsageFilePath();
    EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
}

TEST_F(FileSystemUsageCacheTest, DecrementDirtyWithoutCacheFileTest)
{
    base::FilePath usage_file_path = GetUsageFilePath();
    EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
}

} // namespace content
